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10 May, 20:53

the percent composition by mass of magnesium MgBr2 (gram formula mass = 184 grams/mole) is equal to ...

a - 24/184 x 100

b - 160/184 x 100

c - 184/24 x 100

d - 184/160 x 100

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  1. 10 May, 20:59
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    The percent composition by mass of an element is determined by dividing the molar mass of the element by the molar mass of the compound. In this case, the molar mass of magnesium is 24. Hence the answer to this problem is A. 24/184 x 100
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